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Study on the Shafting Alignment and Axis Orbit

Author: SunShuDe
Tutor: WangHongZhi
School: Dalian Maritime University
Course: Marine Engineering
Keywords: Ship shafting Shafting Alignment Axis Orbit Wavelet Analysis
CLC: U664.21
Type: Master's thesis
Year: 2010
Downloads: 188
Quote: 2
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Abstract


The ship shaft is an important part of the marine power plant, its school quality is good or bad, is very important to ensure the the shafting the long-term normal operation. With the change of the conditions of loading of the ship, sailing area, sea conditions, and other factors, shafting the working conditions are very harsh, and even lead to stern bearing wear increased burning, shafting vibration deterioration accidents continue to occur. Therefore, it is necessary to find a practical way to monitor the operation status of the ship shafting. Especially for the school in the good ship shafting installed, during operation, the actual school quality testing and assessment rarely involved in research at home and abroad. Based on this, we propose a method to assess the state of the ship shafting axis orbit. Axis orbit as important graphic signs of rotating machinery, contains a lot of information, it is able to image, intuitive operation of the display device. General rotating machinery, ship shaft has a large aspect ratio, their core path, not only be able to quickly and efficiently judge shafting school quality, and for ship shaft line monitoring and fault diagnosis to improve the intelligence level of the expert system, and has a very high value. Firstly, the composition of the ship shafting, pointed out that the the ship shaft axis trajectory characteristics in the study on the basis of generally ship shafting layout principles, the ship shafting experimental station set up to study this topic. Taking into account the the ship shafting the actual work environment, the base of the experimental station using the structure of the double bottom of the ship hull deformation in order to simulate the impact of shafting. Secondly, this paper, the finite element analysis software ANSYS finite element model established the ship shafting experimental station Shafting straight alignment calculation and reasonable school, state schools in the bearing loads and shafting deflection, rotation, shear and bending moment numerical results. Finally, the use of eddy current displacement sensor signal acquisition using wavelet packet to the original shaft orbit purification, and compare the results of different wavelet function and decomposition into different layers purification effect obtained Axis Orbit. Ship shaft straight school and reasonably school in the state, each bearing at shaft orbit extraction results shafting calculated results were consistent with and ship shafting dynamic quantitative description of the preliminary results.

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CLC: > Transportation > Waterway transport > Marine Engineering > Ship machinery > Ship shaft,gear,and car device > Shaft
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